aggression
aim
armed
attack
awareness
background
chalkboard
class
classroom
concept
copy
crime
criminal
danger
dangerous
desk
education
fire
firearm
green
gun
gunshot
handgun
indoors
learning
mass
object
pistol
protection
safeguard
safety
school
schooter
security
shoot
shooter
shooting
shot
space
stationery
student
study
target
text
threatening
victim
violence
weapon